Device for delaying the closing of a throttle valve

ABSTRACT

A device for delaying the closing of the throttle valve of an internal combustion engine having a spray carburetor and used for driving a car, has an operating section fixed to the spray carburetor and a controlling section separated from the operating section and fixed to a part of the car body, the operating space of the operating section being connected by a hose conduit with the interior of the controlling section.

United States Patent Inventor Erwin Wawrziniok lngolstadt, Germany App]. No, 731,816 Filed May 24, 1968 Patented Nov. 30, 1971 Assignee Auto Union GmbH Ingolstadt, Germany Priority July 25, 1967 Germany A 56351 DEVICE FOR DELAYING THE CLOSING OF A THROTTLE VALVE References Cited UNITED STATES PATENTS 12/1931 4/1936 11/1950 ll/195l 10/1954 3/1956 10/1957 3/1966 Primary Examiner-Mark M. Newman Attorney-Richards & Geier 123/1035 123/103C 123/103C 123/103E 123/103C 123/1035 123/1035 123/103E ABSTRACT: A device for delaying the closing of the throttle valve of an internal combustion engine having a spray carburetor and used for driving a car, has an operating section fixed to the spray carburetor and a controlling section separated from the operating section and fixed to a part of the car body, the operating space of the operating section being connected by a hose conduit with the interior of the controlling section.

1 Claim, 2 Drawing Figs.

U.S. C1 123/103 C, 123/103 E Int. Cl F02d ll/08 Ficldoisearch 123/103 C. 103 E L u Thro/fle Valve 1--;/ L l6 '-(0/- 5003 I] If 2 PATENTED V 30197 3.623 ,465

SHEET 2 OF 2 DEVICE FOR DELAYING THE CLOSING OF A THROTTLE VALVE This invention relates to a device for delaying the closing of the throttle valve of an internal combustion engine with a spray carburetor used for driving a car.

In prior art the operating section of such a device constituted a closed aggregate with the controlling section of the device. A hose conduit connected the interior of the controlling section with the interior of the suction pipe of the internal combustion engine. Drawbacks of this construction consist in that sometimes the controlling section is involuntarily displaced, the distributing valve becomes leaky and the barometer box is damaged.

An object of the present invention is to eliminate these drawbacks in a simple manner.

Other objects of the present invention will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention it was found desirable to fix the operating section to the spray carburetor of the internal combustion engine, while the controlling section is made separate from the operating section and is fixed to a part of the car body, the operating space of the operating section being connected by a hose conduit with the inner space ofthe controlling section.

This construction has made it possible to eliminate completely errors in a throttle valve check and to use throttle valve checks which were previously found effective, for example, in four cylinder boxer motors, in series four cylinder engines as well.

An embodiment of the present invention can consist of a construction in which the operating space in the operating section is closed by a plate to which a conduit joint is attached; the conduit joint connects the operating space with a conduit and with another conduit joint carried by a pot, the interior of the pot being connected by a valve and a conduit with the interior of the suction pipe. This construction has the advantage that the parts ofa throttle valve check which are known per se and which have proven their usefulness, are effectively utilized and that a throttle valve check is provided with small expenditure which is reliable in all uses which can occur in practree.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing,

FIG. 1 of which shows, partly in section and partly in side view, a preferred embodiment of the inventive idea.

FIG. 2 is a diagrammatic side view showing connections of the device of the present invention to various parts of the engine.

The device shown in the drawing has an operating section I and a controlling section 2. The operating section I is fixed to the spray carburetor of the internal combustion engine indicated diagrammatically by the numeral 30. The controlling section 2 is fixed to a part of the car body indicated diagrammatically by the numeral 31. The operating section 1 consists ofa box composed of casing parts 3 and 4. The parts 3 and 4 are connected with each other by shaped flanges A diaphragm 5 is attached to this juncture, the center of the diaphragm being coupled with a rod 6. The diaphragm 5 is tensioned by a coiled spring 7 which is located substantially in the part 4. The rod 6 carries a stop ring 70. The part 4 carries a closing plate 8 upon which a conduitjoint 9 is fixed. A hose conduit 10 has an end mounted upon the conduit joint 9. The other end of the conduit 10 is connected with a conduit joint 11, so that the conduit 10 connects the operating chamber 12 of the operating section I with the space 13 within the controlling section 2. The space 13 is enclosed by a pot 14 provided with flanges. Screws l7 connect the valve casing 16 of the controlling section 2 with the flanges of the pot 14 as well as with a casing 15. The casing 15 contains a barometric member 18 the length of which is changed depending upon air pressure. This change in length is transmitted by a pin 19 to the stem ofa valve 20. A diaphragm 21 is fixed between the valve casing 16 and the casing 15. The diaphragm 21 along with a return spring 22 actuate the valve 2 A conduit 23 extends into the interior of the valve casing 16 and is connected by a flexible pipe with the interior of the suction pipe of the internal combustion engine indicated diagrammatically by the numeral 32.

In operation, when the gas pedal actuating the throttle valve of the spray carburetor is relieved from pressure of the foot of the driver, a greater subpressure will be effective through the conduit 23 in the interior of the valve casing 16 and thus upon the diaphragm 21, particularly in the case of medium or higher revolutions. Consequently, the valve 20 will be opened against the pressure of the return spring 22 and subpressure within the casing 16 will be transmitted to the operating chamber 12 through the conduitjoint 11, the hose conduit 10 and the conduit joint 9. Subpressure affects the diaphragm 5 which will move the rod 6 to the right against the pressure of the spring 7 (looking in the direction of the drawing). This movement of the rod 6 which is pivotally connected with the lever of the throttle valve indicated diagrammatically by the numeral 33, will not permit a complete closing of the throttle valve, so that a short overflow ofgas in the gas pipe can not take place.

The operating section 1 fixed to the spray carburetor participates in the shaking movements of the engine, as well as the rod 6 and a part of the hose conduit 10. However, the operating section will not suffer thereby since the connected parts can easily bear the shakings. The sensitive parts, such as the barometric member 18 and the valve 20 are placed for that purpose along with the setting device in the controlling section 2. This section is fixed to a part of the car body and is not exposed to shakings which could detrimentally affect the life of the diaphragm, the tightness of the valve or the location ofthe various parts in predetermined positions.

What is claimed is:

I. In a car having a car body, a section pipe connected with said car body, a spray carburetor connected with said section pipe and a throttle valve connected with said spray carburetor, a device for delaying the closing of the throttle valve, said device comprising an operating section fixed to said spray carburetor, a separate controlling section fixed to said car body, said operating section comprising a casing, a diaphragm within said casing, a rod extending through said casing, said rod having one end connected with one side of said diaphragm and another end connected with said throttle valve, a spring within said casing, said spring engaging the other side of said diaphragm, and a conduit joint carried by said casing and located opposite said rod; said controlling section comprising a casing, another conduit joint carried by the last-mentioned casing, a valve located within the last-mentioned casing and spaced from said other conduit joint, a barometric member located within the last-mentioned casing and operatively connecting with said valve and a conduit carried by the last-mentioned casing and connecting said valve with the suction pipe: and a hose conduit connecting the conduit joint of the operating section with the conduitjoint ofthe controlling section. 

1. In a car having a car body, a section pipe connected with said car body, a spray carburetor connected with said section pipe and a throttle valve connected with said spray carburetor, a device for delaying the closing of the throttle valve, said device comprising an operating section fixed to said spray carburetor, a separate controlling section fixed to said car body, said operating section comprising a casing, a diaphragm within said casing, a rod extending through said casing, said rod having one end connected with one side of said diaphragm and another end connected with said throttle valve, a spring within said casing, said spring engaging the other side of said diaphragm, and a conduit joint carried by said casing and located opposite said rod; said controlling section comprising a casing, another conduit joint carried by the last-mentioned casing, a valve located within the last-mentioned casing and spaced from said other conduit joint, a barometric member located within the last-mentioned casing and operatively connecting with said valve and a conduit carried by the last-mentioned casing and connecting said valve with the suction pipe: and a hose conduit connecting the conduit joint of the operating section with the conduit joint of the controlling section. 